Curious about my broken hand?

so i broke my hand the other day skateboarding... i let i tbe over night cuz i thought it was just sprained... ive never broken a bone before either so wasnt the first thing to come into my mind... now my friends got me to go to the hospital to get it checked out (the rreal reason was so i could fake a script of drugs)... come to find out ive broken my first bone!!!!! right behind my thumb... i have a half cast now and i go for my full cast tom... they say i shouldnt use my hand for 3 months which basically ruins my summer as im a beginner biker trying to land 360's barspins, grinds, all types of ****... i won a skate competition on saturday with ym hand being broke but id like to know for how long should i really not use my hand for... i mean could i rip the cast off next weekend or tghe week after cuz i really need to get back on my bike and skateboard.... im dying and its been only a few days!!!!! i feel like im being held captive in someones basement with no fresh air!!!! hellllp